Machine for making dovetails.



No. 6%,)6. Patented Dec. 3|, I9OI. P. HANSEL.

MACHINE FOR MAKING DOVETAILS.

(Applicationffled Jan. 25, 1901.)

2 Sheets-Sheet I.

(No Model.)

I l I wl'ina sfes m: norms versus co, moroumm wAsnmuwm v c No. GQUJUS.Patented Dec. 3|, l90l. P. HANSEL.

MACHINE FOR MAKING DDVETAILS.

(Application filed Jan. 1901) (No Model.) 2 ShaetsSheet 2.

THE NORmS Farms 00, mom-ummwAsnmmom a c.

UNTTE STATES PATENT OEFI-c'.

PAUL HANSEL, OF OTTENSEN, GERMANY.

MACHINE FOR MAKING DOVETAILS.

SPECIFIGATIUN forming part of Letters Patent N0. 690,106, dated December31, 1901.

Application filed January 25, 1901. Serial No. 44,745. (No model.)

To all whom it may concern:

Be it known that I, PAUL HANsEL, a subv ject of the Emperor of Germany,residing at 250 Bahrenfelderstrassc, Ottensen, German Empire, haveinvented a new and useful Machine for Making Dovetails, of which thefollowing is a specification.

My invention consists of a new and improved shaping-machine forproducing in a board to be dovetailed the desired dovetail tenons.

In the following specification the invention is fully described and setforth, so that any one skilledin the art may readily understand themachine.

In the accompanying drawings, in which similar figures of referencerefer throughout to similar parts, Figure 1 shows an elevation of themachine. Fig. 2 is partially a horizontal section and partially a planof Fig. 1. Fig. 3 is a diagram illustrating the action of theknife-heads. Fig. 4 represents the plan of the knife-heads.

Mountedupon a bed-plate 1 are frames 8, which are adjustable to and froin the guideways formed by the grooved plates 2, fastened on the upperface of bed-plate 1. Standards 4 4 are mounted on frames 3 3 and haveslotted ears 13 13, Fig. 2, near their base,through which clamping-boltsare passed in order to fasten them to said frames. As these ears 13 areso slotted the standards may be angularly adjusted within certain limitsfor the purposes hereinafter set forth. Formed in each of standards 4are suitable bearings in which are mounted axles 5 6, carrying on theiradjacent ends meshing cogs 7 and 8. On one of said axles 5 and 6 abelt-pulley 9 is fastened, the belt for which is preferably led theretoover a sheave or guide-pulley, (not shown,) so as to insure its constantengagement at whatever angle the shafts or axles are adjusted. Mountedon each axle and behind the respective cogs 7 and 8 are the knife-heads,each consisting of an equal number of arms 10 11, fastened rigidly ontotheir respective axles. Each arm is provided near its outer end with anangular slotted groove in which the shank of a knife 12 is adjustablysecured by a clampingbolt. (See Fig. 4..) Secured to the said plate 1are suitable uprights 14, to which are fastened the ends of a horizontalrail 15, on which is sliding a support 16. Apinion 17, journaled on saidsupport-gears with a rack 18, fastened between said uprights 14. A pawl19, also connected with said support 16, engages a toothed rack 20,while a handwheel 21, provided with some suitable device, as aworm-gear, (not shown,) is also fastened on said support and engages aslide 22, vertically adjustable in said support. A curved arm 23,connected with said slide, carries a clamping-screw 24, by means ofwhich the board, &c., 25 which is to have the tenons formed on its loweredge is secured and held in position. By revolvingwheel 21 the saidboard is carried downwardly, so as to continually present a freshsurface to the knives as they cut their way in when forming the tenon,and by releasing pawl 19 the support may be moved along the rail 15 forthe purpose of forming another tenon, while the toothed rack 20 permitsexact spacing of the said tenons.

The action of the pair of knife-heads for forming the tenons is mosteasily seen from the diagram shown by Fig. 3. Here the axles arerepresented by dotted lines 5 and 6. Badially extending therefrom arethe respective knife-head arms 10 and 11, the heads being so mounted ontheir respective axles that their arms stand at a certain equal anglefrom each other. As each head is here shown with four arms, itconsequently follows that they are in this instance at angles offorty-five degrees from one another. As the axles 5 and 6 1'0- tate thearms are carried therewith, the planes of which form an acute angle, sothat as the several knives are in the act of cutting they aremomentarily crossing the plane described by those arms next adjacent oneach side, while the latter belong to the other knifehead. This anglecan be modified by adjust-' ing the standards 4: 4:, so that any desiredtenon may be formed, while its width can be regulated by advancing orwithdrawing the frames 3 3 in their respective guides. Cogs 7 and 8 maybe replaced by any universal coupling, it being only essential that theaxles 5 and 6 rotate together, inasmuch as otherwise since theirrespective knife-arms are constantly crossing each others planes theywould conflict.

frames, axles mounted in said standards coupled in pairs and adapted tobe set at any desired angle to each other, knife-heads comprising aplurality of radial arms mounted in said axles, said arms being adaptedto alternately cross the planes described by those next adjacent,adjustable knives in theends of said arms, and suitable and movablesupports for carrying and holding the boards, said parts being combinedsubstantially as and for the purpose described.

PAUL HANSEL.

Witnesses:

E. H. L. MUMMENHOFF, IDA HAFERMANN.

